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Ruby ODM framework for MongoDB

tag: v0.9.1

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README.textile

Overview

About Mongoid

Mongoid is an ODM (Object-Document-Mapper) framework for MongoDB in Ruby.

Project Tracking

Mongoid on Pivotal Tracker
Mongoid Google Group
Mongoid on CI Joe

Compatibility

Mongoid is developed against Ruby 1.8.6, 1.8.7, 1.9.1, 1.9.2

Note API changes will be frequent until the 1.0 release, and do not expect the gem to be of full production quality until that point.

Mongoid in Action

Initialize Mongoid:

  Mongoid.connect_to("myapp_database_name")

Example of a simple domain model:

  class Person < Mongoid::Document
    include Mongoid::Versioning
    field :title
    field :age, :type => Integer, :default => 0
    has_many :addresses
    has_one :name
  end

  class Address < Mongoid::Document
    field :street
    field :city
    field :state
    field :post_code
    belongs_to :person, :inverse_of => :addresses
  end

  class Name < Mongoid::Document
    include Mongoid::Timestamps
    field :first_name
    field :last_name
    belongs_to :person, :inverse_of => :name
  end

Mongoid supports all the basic ActiveRecord creation and persistence methods.

Creation:

  Person.create(:title => "Esquire")
  Person.create!(:title => "Sir", :name => { :first_name => "Elton", :last_name => "John" })

Save:

  person.save
  person.save!

Updating:

  person.update_attributes(:title => "Sir")
  person.update_attributes!(:name => { :first_name => "Emmanuel", :last_name => "Zorg" })

Deleting:

  person.destroy
  Person.destroy_all(:title => "Sir")
  person.delete
  Person.delete_all(:title => "Sir")

Count:

  Person.count

Retrieval of Documents from the database can be done in the traditional ActiveRecord
manner or done using the Mongoid criteria DSL.

Old School:

  Person.find(:all, :conditions => { :title => "Esquire" })
  Person.find(:first, :conditions => { :title => "Esquire" })
  Person.first(:conditions => { :title => "Sir" })
  Person.all(:conditions => { :title => "Sir" })

New School:

  Person.select(:first_name, :last_name).where(:title => "Sir").skip(10).limit(10).paginate
  Person.select(:title).aggregate
  Criteria.translate(:conditions => { :title => "Sir" }).execute

Chaining Scopes:

Class methods that return criteria, either through the Criteria API or the traditional Finder API, can
be chained, similar to DataMapper.

  class Person < Mongoid::Document
    field :title
    field :age, :type => Integer

    class << self
      def knighted
        criteria.where(:title => "Sir")
      end
      def old
        criteria.where(:age => { "$gt" > 70 })
      end
    end
  end

  Person.old.knighted
  Person.old.paginate

Paginate Document search results:

  Person.paginate(:conditions => {:title => "Esquire"}, :page => 1, :per_page => 20)

Versioning:

Versioning can be added by including Mongoid::Versioning in your document. This will give
a version field, and will update the version number with each save. Additionally each
version of the document will be stored in a versions array, embedded within the document.

  class Person < Mongoid::Document
    include Mongoid::Versioning
    field :title
  end

  @person = Person.new
  @person.save # Version 1
  @person.title = "Madam"
  @person.save # Version 2
  @person.versions.size = 1

Validations:

Mongoid supports all validations provided by Jay Fields’ Validatable gem.
For more information please see the Validatable documentation.

Validatable on RubyForge

License

Copyright © 2009 Durran Jordan

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Credits

Durran Jordan: durran at gmail dot com

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